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Figure 1-2 The Bell-LaPadula model The first rule, the simple property, states that if a user has a particular level of access, then that user is not allowed to access any information resources that have a higher classification than the user does In essence, a user that has only unclassified access will only be able to access unclassified files A user with confidential access will be able to access confidential and unclassified files, but not secret or top secret files The simple property is an intuitive rule that is very often called no read up The star property, also called the confinement property, is the second rule If a user has secret level access, then the user is not allowed to write any files or create any resources that have a lower level of access.

The second column displays the quantity of the product to buy as an integer and the third a text string describing the product. All of the columns use GtkCellRendererText for rendering; GtkCellRendererText is a cell renderer capable of displaying Boolean values and various number formats (int, double, and float) as text strings.

The view s responsibility can be deceptively simple. Its goal in life is to take the model given to it and use it to render content. Because the controller and related services already executed all the business logic and packaged the results into a model object, the view only needs to know how to take that model and turn it into HTML. Although this separation of concerns removes much of the responsibility that can plague traditional ASP.NET applications, views still need to be carefully and deliberately designed. Views require knowledge and understanding of the building blocks of the web, including HTML, CSS, and JavaScript. In this chapter, we ll examine how ASP.NET MVC renders views, how the default WebFormViewEngine functions, and how to structure and organize views. Then we ll look at a couple of approaches for using the model to render content in a view. Finally, we ll cover the templating features new to ASP.NET MVC 2.

Figure 8-4. A tree view widget using a GtkListStore tree model Listing 8-1 creates a GtkListStore object, which displays a list of groceries. In addition to displaying the products, the list store also displays whether to buy the product and how many of them to buy. This Grocery List application will be used for many examples throughout the rest of the chapter. Therefore, the content of some functions may be excluded later on if it is presented in previous examples. Also, to keep things organized, in every example setup_tree_view() will be used to set up columns and renderers. Full code listings for every example can be downloaded at www.gtkbook.com. Listing 8-1. Creating a GtkTreeView (liststore.c) #include <gtk/gtk.h> enum { BUY_IT = 0, QUANTITY, PRODUCT, COLUMNS }; typedef struct { gboolean buy; gint quantity; gchar *product; } GroceryItem;

A view s responsibility is to render content. But how does the MVC framework decide which view to use How do we control what gets rendered, and how do we organize our content How do we even tell MVC to render a view In the ASP.NET MVC framework, the controller decides, based on user input, that a view should be rendered by returning a ViewResult object from a controller action. Listing 3.1 shows an action returning a ViewResult.

For example, if a user logs into a system and has secret level access, that user is not allowed to write any files that would be accessible by someone with only confidential or unclassified access The idea behind this no write down strategy is that we would not want any information to leak from a higher level to a lower level With this strategy, it would be impossible for someone with secret level access to write out any file in a system that could be read by a user that has only unclassified or confidential access The goal of the star property is to restrict secret-level information only to the appropriate level of classification or above The third property of the Bell-LaPadula model is the tranquility property.